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Marine Grade Stainless Steel Pipe
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Neeka Tubes is a reliable manufacturer, stockist and exporter of Marine Grade Stainless Steel Pipes based in India. We are a supplier of 316 stainless steel pipe, 316L stainless steel pipe, duplex stainless steel pipes, and super duplex stainless steel pipes in the shipbuilding, offshore oil & gas, desalination plants and coastal infrastructure.
We also provide seamless and welded marine grade stainless steel piping assemblies and components such as Sch 40 Marine Grade Stainless Steel PipeΒ which is designed with excellent corrosion protection, high mechanical integrity and superb performance in chloride contents present in marine applications. All our pipes are manufactured to high international quality standards and are price competitive on domestic as well as global projects.
Table of Content
- Benefits of Marine Grade Stainless Steel Pipes
- Grades of Marine Stainless Steel Pipes We Supply
- Marine Grade Stainless Steel Pipe Properties
- Most Common Types of Marine Grade Stainless Steel Pipe
- Marine Grade Stainless Steel Pipe Dimensions Chart
- Marine Grade Stainless Steel Pipe Specifications
- Marine Grade Stainless Steel Thickness Chart
- Packaging & Export Standards
- Quality Testing & Inspection
- Why Choose Neeka Tubes for Marine Stainless Steel Pipes?
- Application of Marine Grade Stainless Steel Pipe
Marine Grade Stainless Steel Pipe, Marine Grade Stainless Steel Pipe Weight Chart, Marine Grade Stainless Steel Pipe Price, SS 304 Marine Pipes, SS Marine Grade 316 Pipes, SS Marine Grade 316L Pipes, Marine Grade Stainless Steel Pipe Sizes, Marine Grade Stainless Steel Pipe Dimensions,
What is Marine Grade Stainless Steel Pipe?
Marine Grade Stainless Steel Pipe is a specially alloyed stainless steel that has resistance to seawater corrosion, brackish water and salt laden coastal air.
The molybdenum (2-3%) present in grades like 316 and 316L increases the resistance to pitting, crevice, and stress corrosion. It also makes the pipes favourable for high-chloride concentration environments.
These pipes are mainly used in the building of ships, offshore structures, desalinators and port installations, where long term performance is important. They are available in seamless and welded forms, and they are compliant with ASTM A312, ASME SA312, ASTM A790, and ASME SA790 standards.
The marine-grade stainless steel pipes also work well in extreme conditions, such as the sub-zero Arctic waters to the highest heat of the tropics, making them suitable for use in marine and industrial applications.
Features of Marine Grade Stainless Steel Pipe
Marine grade stainless steel pipes provide a unique combination of material qualities and functional benefits, making them the preferred choice for shipbuilding, offshore energy, desalination facilities, and coastal infrastructure. These pipes are made of high quality alloys like 316, 316L, Duplex 2205 and Super Duplex 2507 to ensure their effectiveness in salt water and chloride heavy environments.
- Exceptional Corrosion Resistance: Marine-grade stainless steel pipes don’t rust, corrode, or get damaged by salt.They work well even in salty or humid places, so they are great for use on the coast and in the ocean.
- High Strength and Durability: These pipes are built to last.They can handle high pressure, rough handling, and constant exposure to water without bending, cracking or losing strength.
- Thermal Conductivity & Non-Magnetic Properties: They move heat well without becoming magnetic. This makes them good for delicate marine equipment and heat-transfer systems where magnetism could be a problem.
- High Density & Melting Point: Marine grade pipes have high density and can withstand extreme temperatures. They maintain their shape and performance even under intense heat or thermal cycling.
- Intergranular & Pitting Corrosion Resistance: Saltwater and chlorides are unable to pass through these pipes or cause pitting. They are strong and dependable even in rough marine conditions.
By combining these robust properties with proven field performance, Neeka Tubes delivers marine stainless steel piping solutions that ensure safety, reliability, and cost efficiency in the most demanding environments.
Grades of Marine Stainless Steel Pipes We Supply
316 Marine Grade Stainless Steel Pipe
- Contains 2β3% molybdenum for enhanced seawater corrosion resistance.
- Suitable for moderate marine exposure and general shipbuilding applications.
- Commonly used in ship piping, deck fittings, and coastal construction.
316L Marine Grade Stainless Steel Pipe
- Low carbon content for better weldability and reduced carbide precipitation.
- Preferred for welded tanks, fabricated marine structures, and offshore piping.
Duplex 2205 Marine Stainless Steel Pipe
- Twice the strength of standard 300-series stainless steel.
- Excellent resistance to stress corrosion cracking and chloride pitting.
- Used in offshore oil rigs, subsea pipelines, and chemical tankers.
Super Duplex 2507 Marine Stainless Steel Pipe
- Extremely high Pitting Resistance Equivalent Number (PREN).
- Ideal for aggressive chloride environments and high-pressure marine systems.
- Applications include desalination plants, subsea equipment, and offshore platforms.
Marine Grade Stainless Steel Pipe Properties
The marine grade stainless steel pipes offer superior performance, resiliency and reliability in harsh saltwater and coastal environments. Their unique alloy composition and metallurgical structure make them perfectly suited for all shipbuilding, offshore oil & gas, desalination plants and port infrastructure.
Key Properties:
- Superior Corrosion Resistance β Resists pitting, crevice corrosion, and stress corrosion cracking caused by seawater and chloride-rich atmospheres.
- High Tensile & Yield Strength β Withstands heavy loads, dynamic forces, and high-pressure conditions.
- Excellent Temperature Tolerance β Performs reliably from sub-zero Arctic conditions to elevated tropical temperatures.
- Enhanced Weldability β Especially in low-carbon grades like 316L, allowing fabrication without compromising corrosion resistance.
- Long-Term Structural Integrity β Minimal degradation even after decades of service.
Aesthetic Finish β Polished or coated surfaces maintain appearance in public-facing marine installations.
Most Common Types of Marine Grade Stainless Steel Pipe
- Exceptional Corrosion Resistance: Effectively resists saltwater, acids and harsh marine chemicals.
- High Strength & Durability: Maintains structural integrity under high pressure and varying temperatures.
- Thermal Conductivity & Non-Magnetic Properties: Makes sure there is efficient heat dissipation and stability in marine applications.
- High Density & Melting Point: High density material with melting point from 1375Β°C to 1400Β°C to perform in extreme conditions.
- Intergranular & Pitting Corrosion Resistance: Prevents material degradation even in prolonged seawater exposure.
These pipes are very important in docks, piers, and boats. In shipbuilding, our pipes are used in exhaust systems and for moving fluids where it is vital to resist damage. Offshore platforms use our pipes to stay strong and last long in harsh places. Coastal structures need them for seawalls, breakwaters, and other projects. Water desalination plants use our pipes to move fluids, ensuring they last even in tough conditions. These pipes also help safely move fluids, chemicals, and seawater in sea systems. For those considering cost, Marine Stainless Steel Pipe Price per kg varies based on material grade and specifications
Marine Exhaust Pipe
Sch 40 Marine Grade SS 304 Pipe
SCH 80 Marine Grade Stainless Steel Pipe
Marine Grade 316 SS Pipe
Marine Grade 304 Stainless Steel Pipe Specifications
| Size | 1/8β³(10.3mm) to 12β³(323.8mm) |
| Grades | TP -304, 316,316L, |
| Schedule | 5/5S,10/10S,20/20S,40/40S,80/80S,120/120S,160/160S according to ANSI B36.19/36.10 |
| Marine Grade Stainless Steel Pipe Applications | marine fittings, marine fasteners, and marine structures |
| Finish | Satin Finish(180#.240#.320#).,Bright Finish(400#,600#,mirror),Mill Finish(2B),Hairline-Finish(HL/Brushed),Ti-gold, Glossy matt,dull and so on. |
Looking For Fastest Delivery of Marine Grade Stainless Steel Pipe in Mumbai? Find Your Sizes and Thickness of Marine Grade SS Pipe in Our Ready Stock.
Marine Grade Stainless Steel Pipe Chemical Composition
| Grade | Carbon | Manganese | Phosphorous | Sulphur | Silicon | Chromium | Nickel | Molybdenum |
| TP304 | 0.08 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 8.0-11.0 | |
| TP316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 11.0-14.0 | 2.0-3.0 |
| TP316L | 0.035 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 |
Mechanical Properties of Marine Grade Stainless Steel Pipe
| Material | Yield Strength | Heat | Temperure | Tensile Strength | Elongation |
| Ksi (MPa), Min. | Treatment | ΒΊ F(ΒΊ C) | Ksi (MPa), Min. | ||
| TP304 | 30(205) | Solution | 1900 (1040) | 75(515) | 35 |
| TP316 | 30(205) | Solution | 1900(1040) | 75(515) | 35 |
| TP316L | 25(170) | Solution | 1900(1040) | 70(485) | 35 |
Equivalent Grades for Marine Grade Stainless Steel Pipe
| GRADE | UNS NO | DIN/WERKSTOFF |
|---|---|---|
| 316L | S31603 | 1.4404 |
| 304 | S30400 | 1.4301 |
| 316 | S31600 | 1.4436 |
Contact Neeka Tubes today for the best offer & competitive quotation of Marine Grade Stainless Steel Pipe
Please call on +91 7700067892 or drop an email at sales@neekatubes.net.
Marine Grade 316 Stainless Steel Pipe Dimension in MM
| Nominal Pipe Size (inches) | Outside Diameter | Hydraulic Pipe Schedule Chart | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 5S | 10S | 40S | 80S | |||||||
| (mm) | (inches) | Wall Thickness and Weight | ||||||||
| mm (in) | kg/m | mm (in) | kg/m | mm (in) | kg/m | mm (in) | kg/m | |||
| 1/8 | 10.3 | 0.405 | – | – | 1.25 (0.049) | 0.28 | 1.73 (0.068) | 0.37 | 2.42 (0.095) | 0.47 |
| 1/4 | 13.7 | 0.540 | – | – | 1.66 (0.065) | 0.49 | 2.24 (0.088) | 0.63 | 3.03 (0.119) | 0.80 |
| 3/8 | 17.2 | 0.675 | – | – | 1.66 (0.065) | 0.63 | 2.32 (0.091) | 0.85 | 3.20 (0.126) | 1.10 |
| 1/2 | 21.3 | 0.840 | 1.65 (0.065) | 0.81 | 2.11 (0.083) | 1.00 | 2.77 (0.109) | 1.27 | 3.74 (0.147) | 1.62 |
| 3/4 | 26.7 | 1.050 | 1.65 (0.065) | 1.02 | 2.11 (0.083) | 1.28 | 2.87 (0.113) | 1.68 | 3.92 (0.154) | 2.20 |
| 1 | 33.4 | 1.315 | 1.65 (0.065) | 1.30 | 2.77 (0.109) | 2.09 | 3.38 (0.133) | 2.50 | 4.55 (0.179) | 3.24 |
| 1 1/4 | 42.2 | 1.660 | 1.65 (0.065) | 1.66 | 2.77 (0.109) | 2.69 | 3.56 (0.140) | 3.39 | 4.86 (0.191) | 4.47 |
| 1 1/2 | 48.3 | 1.900 | 1.65 (0.065) | 1.91 | 2.77 (0.109) | 3.11 | 3.69 (0.145) | 4.06 | 5.08 (0.200) | 5.41 |
| 2 | 60.3 | 2.375 | 1.65 (0.065) | 2.40 | 2.77 (0.109) | 3.93 | 3.92 (0.154) | 5.45 | 5.54 (0.218) | 7.49 |
| 2 1/2 | 73.0 | 2.875 | 2.11 (0.083) | 3.69 | 3.05 (0.120) | 5.26 | 5.16 (0.203) | 8.64 | 7.01 (0.276) | 11.4 |
| 3 | 88.9 | 3.500 | 2.11 (0.083) | 4.52 | 3.05 (0.120) | 6.46 | 5.49 (0.216) | 11.3 | 7.62 (0.300) | 15.3 |
| 3 1/2 | 101.6 | 4.000 | 2.11 (0.083) | 5.18 | 3.05 (0.120) | 7.41 | 5.74 (0.226) | 13.6 | 8.08 (0.318) | 18.6 |
| 4 | 114.3 | 4.500 | 2.11 (0.083) | 5.84 | 3.05 (0.120) | 8.37 | 6.02 (0.237) | 16.1 | 8.56 (0.337) | 22.3 |
| 5 | 141.3 | 5.563 | 2.77 (0.109) | 9.46 | 3.41 (0.134) | 11.6 | 6.56 (0.258) | 21.8 | 9.53 (0.375) | 31.0 |
| 6 | 168.3 | 6.625 | 2.77 (0.109) | 11.3 | 3.41 (0.134) | 13.9 | 7.12 (0.280) | 28.3 | 10.98 (0.432) | 42.6 |
| 8 | 219.1 | 8.625 | 2.77 (0.109) | 14.8 | 3.76 (0.148) | 20.0 | 8.18 (0.322) | 42.5 | 12.70 (0.500) | 64.6 |
| 10 | 273.1 | 10.750 | 3.41 (0.134) | 22.7 | 4.20 (0.165) | 27.8 | 9.28 (0.365) | 60.4 | 12.70 (0.500) | 81.5 |
| 12 | 323.9 | 12.750 | 3.97 (0.156) | 31.3 | 4.58 (0.180) | 36.1 | 9.53 (0.375) | 73.9 | 12.70 (0.500) | 97.4 |
Marine Grade Stainless Steel Pipe Thickness Chart
| Nominal wall thickness comparsion table for Marine Grade stainless steel pipe | |||||
|---|---|---|---|---|---|
| DN in | DN mm | Οmm | SCH 40S | SCH 10S | Sch 40 |
| 1/2 | 15 | 21.3 | 2.77 | 2.11 | 2.77 |
| 1/8 | 6 | 10.3 | 1.73 | 1.24 | 1.73 |
| 3/4 | 20 | 26.7 | 2.87 | 2.11 | 2.87 |
| 1/4 | 8 | 13.7 | 2.24 | 1.65 | 2.24 |
| 3 1/2 | 90 | 101.6 | 5.74 | 3.05 | 5.74 |
| 3/8 | 10 | 17.1 | 2.31 | 1.65 | 2.31 |
| 2 1/2 | 65 | 76 | 5.16 | 3.05 | 5.16 |
| 1 | 25 | 33.4 | 3.38 | 2.77 | 3.38 |
| 5 | 125 | 141.3 | 6.55 | 3.4 | 6.55 |
| 2 | 50 | 60.3 | 3.91 | 2.77 | 3.91 |
| 12 | 300 | 323.8 | 9.53 | 4.57 | 10.31 |
| 1 1/4 | 32 | 42.2 | 3.56 | 2.77 | 3.56 |
| 8 | 200 | 219.1 | 8.18 | 3.76 | 8.18 |
| 1 1/2 | 40 | 48.3 | 3.68 | 2.77 | 3.68 |
| 3 | 80 | 88.9 | 5.49 | 3.05 | 5.49 |
| 14 | 350 | 355.6 | – | 4.78 | 11.13 |
| 4 | 100 | 114.3 | 6.02 | 3.05 | 6.02 |
| 18 | 450 | 457 | – | 4.78 | 14.27 |
| 6 | 150 | 168.3 | 7.11 | 3.4 | 7.11 |
| 16 | 400 | 406.4 | – | 4.78 | 12.7 |
| 10 | 250 | 273 | 9.27 | 4.19 | 9.27 |
| 24 | 600 | 610 | – | 6.35 | 17.48 |
| 20 | 500 | 508 | – | 5.54 | 15.09 |
| 28 | 700 | 711 | – | – | – |
| 22 | 550 | 559 | – | 5.54 | – |
| 30 | 750 | 762 | – | 7.92 | – |
| 26 | 650 | 660 | – | – | – |
| 34 | 850 | 864 | – | – | 17.48 |
| 32 | 800 | 813 | – | – | 17.48 |
| 36 | 900 | 914 | – | – | 19.05 |
Packaging & Export Standards
Packaging, Delivery & Certifications
At Neeka Tubes, we make sure that each marine grade stainless steel pipe reaches you in perfect condition and ready for immediate installation, no matter where you are located.
- Protective Plastic End Caps β Prevent contamination, moisture ingress, and mechanical damage to pipe ends.
- Moisture-Proof Wrapping β Shields against rust and oxidation during long transit times.
- Heavy-Duty Export Packaging β Pipes are bundled and secured in wooden crates, pallets, or steel frames for maximum protection.
- ISPM 15-Compliant Wooden Packaging β Approved for international shipping, ensuring smooth customs clearance.
Quality Testing & Inspection
Every Neeka Tubes Marine Grade Stainless Steel Piping is tested to ensure structural integrity, corrosion resistance, and precise dimensions before dispatch:
- Hydrostatic Testing β Confirms the pipe can withstand operational pressure without leaks.
- Eddy Current Testing β Detects surface cracks, pits, or other discontinuities.
- Positive Material Identification (PMI) β Verifies alloy composition for compliance with order specifications.
- Salt Spray Testing (ASTM B117) β Simulates years of seawater exposure to ensure long-term performance.
- Ultrasonic Testing (UT) β Checks for internal flaws that may compromise pipe strength.
Why Choose Neeka Tubes for Marine Stainless Steel Pipes?
We are a reliable SS marine grade pipe manufacturer, not just in India but worldwide. We are so much more than a supplier of Marine Grade Stainless Steel Pipes at Neeka Tubes. We deliver quality, reliability and customer satisfaction in the marine and offshore sector, which qualifies us as different.
- ISO 9001:2015 Certified β Ensuring consistent quality, strict process control, and adherence to global manufacturing standards.
- 20+ Years of Industry Experience β Proven track record in stainless steel manufacturing, fabrication, and global supply.
- Extensive Ready Stock β Immediate availability for fast dispatch across India and international markets.
- Custom Fabrication Services β Special lengths, coatings, finishes, and end-preparations tailored to your project requirements.
- Global Export Expertise β Supplying to over 40 countries with full compliance to international shipping regulations and documentation.
- Material Test Certificates (EN 10204 3.1) β Every order comes with complete traceability and verified chemical & mechanical properties.
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Applications of Marine Stainless Steel Pipes
Marine Grade Stainless Steel Pipes, a type of Marine Steel Pipe, are engineered to deliver exceptional corrosion resistance, high strength, and long service life in some of the most demanding environments on earth. From shipbuilding to desalination plants.
- Shipbuilding & Repair β Used in ballast water systems, deck and bilge piping, engine exhaust lines, safety railings, cargo handling pipelines, and firewater systems for vessels operating in seawater environments.
- Offshore Oil & Gas β Ideal for subsea pipelines, production risers, topside process piping, and platform utility lines where chloride stress corrosion resistance is essential.
- Coastal Infrastructure β Suitable for jetties, piers, ferry terminals, seawalls, loading docks, and bridge structures exposed to tidal and salt spray conditions.
- Desalination Plants β Applied in high-pressure feed water lines, brine discharge pipes, evaporator piping, and intake structures handling corrosive seawater.
- Marine Equipment Manufacturing β Used for ladders, gangways, anchor systems, mooring equipment, subsea frames, and underwater support structures requiring high mechanical strength and long-term durability.
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